It's made to fit with most. I can't say it'll be a perfect match with each and every manufacturer but we strive to stay + or - .001 with our CNC machines for this very reason. I can't say how close other manufacturers stay but I've had it on a rock river upper and it fit.

When we first started putting all of this together there were very little parts available. We wanted to put out a product that the consumer wouldn't have to look for and wait on additional parts in order to get it working. There were too many people gouging for parts and we were looking to streamline the places you'd have to go in order to complete everything.

We will make one with a forward assist in the future but for right now we wanted to keep it as simple as possible for the end user.

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